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arXiv Front: RA Rings and Algebras
http://front.math.ucdavis.edu/math.RA
Rings and algebras section of the mathematics e-print arxiv.
Associative Rings and Algebras
http://www.math.niu.edu/~rusin/known-math/index/16-XX.html
Section 16 of Dave Rusin's archive of known mathematics.
Basic Books on Rings and Modules
http://www.math.hawaii.edu/~lee/algebra/references.html
A reading list by Lee Lady, University of Hawaii.
Group Photographs from Noncommutative Ring Theory
http://math.uc.edu/~hodgestj/pics.htm
Taken by Tim Hodges.
Nonassociative Rings and Algebras
http://www.math.niu.edu/~rusin/known-math/index/17-XX.html
Section 17 in Dave Rusin's Mathematical Atlas.
Ring Theory Resources
http://www.uwm.edu/People/adbell/RT/
Compiled by A.D. Bell.
The Commutative Ring Theory Webring Home Page
http://www.math.purdue.edu/~mrogers/webring.html
A webring devoted to pages concerning commutative ring theory.